JCB KAA0676 Inner Track Roller Assembly

The KAA0676 inner track roller is a critical undercarriage component designed for mini excavators in the 6-7 metric ton operating weight class. It functions as a lower roller with an inner flange configuration to guide the track chain links. The roller shell is manufactured from 40Cr or 40MnB alloy steel, processed through forging, machining, and induction hardening to achieve high surface wear resistance and core toughness. The assembly utilizes a floating duo-cone seal system to retain lubricant and exclude abrasive contaminants, ensuring extended service life in demanding excavation environments. The unit weight is approximately 15 kg. This part serves as a direct replacement for OEM references across JCB, Sumitomo, and Link-Belt platforms sharing common undercarriage architecture.